#include <syscall.h> 
#include <errno.h> 
_syscall1(int,print_info,int,testflag) 
main() 
{ 
int i=1; 
i= print_info(0); 
if(i==0) 
{printf("i=%d , syscall succeed!\n",i);} 
else {printf("i=%d,syscall failed!\n",i);} 
}